Here's a quick self-examination acronym. Four things to check out on yourself when you're feeling impatient, grumpy, irritable...Ask yourself these questions:
H--Am I hungry?
A--Am I angry?
L--Am I lonely?
T--Am I tired?
If you are experiencing two or more of these conditions, it's time to halt and give yourself a break. Drink some cold water, eat a nutritious snack, take a power nap or a walk, call a friend, journal, stretch, take some deep breaths--whatever suits your fancy. You'll be feeling more peace in no time.
Be kind and good to yourself and stay mindful of your own needs.